Man Linux: Main Page and Category List

abs, labs, llabs, imaxabs - compute the absolute value of an integer

#include<stdlib.h>intabs(intj);longintlabs(longintj);longlongintllabs(longlongintj);#include<inttypes.h>intmax_timaxabs(intmax_tj);Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):llabs(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; orcc-std=c99

Theabs() function computes the absolute value of the integer argumentj. Thelabs(),llabs() andimaxabs() functions compute the absolute value of the argumentjof the appropriate integer type for the function.

Returns the absolute value of the integer argument, of the appropriate integer type for the function.

SVr4, POSIX.1-2001, 4.3BSD, C99. C89 only includes theabs() andlabs() functions; the functionsllabs() andimaxabs() were added in C99.

Trying to take the absolute value of the most negative integer is not defined. Thellabs() function is included in glibc since version 2.0, but is not in libc5 or libc4. Theimaxabs() function is included in glibc since version 2.1.1. Forllabs() to be declared, it may be necessary to define_ISOC99_SOURCEor_ISOC9X_SOURCE(depending on the version of glibc) before including any standard headers. GCC handlesabs() andlabs() as built-in functions. GCC 3.0 also handlesllabs() andimaxabs() as built-ins.

cabs(3),ceil(3),fabs(3),floor(3),rint(3)

This page is part of release 3.24 of the Linuxman-pagesproject. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.